초록 ▼

In a battery charging system for an automobile, the conduction rate of a switching circuit which controls field current of the generator is detected, while engine speed is also detected. Since the conduction rate represents the actual amount of electricity generated by the generator, the conduction

In a battery charging system for an automobile, the conduction rate of a switching circuit which controls field current of the generator is detected, while engine speed is also detected. Since the conduction rate represents the actual amount of electricity generated by the generator, the conduction rate as well as engine speed is used to determine optimal engine idle speed. To this end desired conduction rate values for various engine speeds within idle speed range are prestored in a memory, and a desired conduction rate is read out using detected engine speed so that a detected conduction rate will be compared with the desired conduction rate. Using the result of comparisonn, idle speed is either increased or decreased so that the actual conduction rate approaches the desired conduction rate. In one embodiment, the generator is disabled when the actual conduction rate is greater than the desired conduction rate in order to prevent engine stall.

대표청구항 ▼

An engine idle speed control apparatus for use with an engine driven generator of an automobile having at a least a field coil, comprising: (a) switching means for controlling current flowing through said field coil of said generator; (b) first means for detecting first data which is a function of c

An engine idle speed control apparatus for use with an engine driven generator of an automobile having at a least a field coil, comprising: (a) switching means for controlling current flowing through said field coil of said generator; (b) first means for detecting first data which is a function of conduction rate of said switching means; (c) second means for detecting second data which is a function of the rotational speed of said engine or said generator; (d) computing means responsive to the detected first data received from said first means and responsive to the detected second data received from said second means for: deriving a reference which is determined as a function of a desired conduction rate of said switching means, corresponding to said second data, from said computing means; comparing said detected first data with the reference; producing a control signal in accordance with the results of the comparison; and (e) idle speed control means responsive to said control signal for controlling the rotational speed of said engine, so that the detected first data approaches the reference.